| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 34°F | 28°F | 10.5" |
| February | 27°F | 40°F | 32°F | 1.8" |
| March | 31°F | 49°F | 39°F | 2.0" |
| April | 37°F | 59°F | 47°F | 1.0" |
| May | 45°F | 70°F | 56°F | 1.9" |
| June | 51°F | 76°F | 62°F | 2.4" |
| July | 58°F | 87°F | 71°F | 0.8" |
| August | 56°F | 85°F | 69°F | 1.1" |
| September | 48°F | 73°F | 58°F | 1.5" |
| October | 39°F | 57°F | 46°F | 2.2" |
| November | 31°F | 43°F | 35°F | 2.3" |
| December | 22°F | 32°F | 26°F | 8.7" |
| Index | Troy | Montana | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 968,253 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 302 |
| Days with moderate air quality | 62 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Troy, MT | 972 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Lakeview, AR | 972 | 36 | 28.0% |
| Brunswick, MO | 972 | 38 | 24.0% |
| Clarkton, NC | 972 | 30 | 40.0% |
| Lake Waynoka, OH | 972 | 43 | 14.0% |
| Pound, VA | 972 | 45 | 10.0% |
| Troy, MT | 972 | 37 | 26.0% |
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